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(1 華南理工大學(xué)土木工程系 廣州 510641；2 廣東省建筑設(shè)計研究院 廣州 510010)
［提要］進(jìn)行了10個帶約束拉桿和5個不設(shè)約束拉桿方形鋼管混凝土短柱軸心受壓構(gòu)件的試驗研究。主要研究參數(shù)為約束拉桿直徑和間距、鋼管厚度、鋼材強(qiáng)度等。試驗研究表明，在軸心壓力作用下，方形鋼管混凝土短柱在設(shè)置了約束拉桿后，能有效改善橫截面周邊中部鋼管對核心混凝土的約束作用，延遲或避免鋼管在應(yīng)力達(dá)到屈服強(qiáng)度前發(fā)生失穩(wěn)性的局部屈曲而導(dǎo)致構(gòu)件的過早破壞，從而使方形鋼管混凝土軸壓短柱的承載力和延性均有較大幅度的提高。同時，應(yīng)用現(xiàn)有規(guī)范及規(guī)程有關(guān)方形鋼管混凝土承載力計算公式，對帶約束拉桿方形鋼管混凝土軸壓試件承載力進(jìn)行計算，計算結(jié)果與試驗結(jié)果相比較為保守。
［關(guān)鍵詞］ 方形鋼管混凝土 約束拉桿 極限承載力 延性
Investigation of Behavior of Square CFT Stub Columns with Binding Bars Under Axial Loads/He Zhenqiang1,Cai Jian1,Chen Xing2(1 Dep. of Civil Engineering,Huanan University of Science and Engineering,Guangzhou 510641,China; 2 The Architectural Design and Research Institute of Guangdong Province,Guangzhou 510010,China)
Abstract:The behavior of square concretefilled steel tubular (CFT) stub columns with binding bars subjected to axially loading is experimentally investigated, including10 specimens with binding bars and 5 ones without binding bars. The main parameters are diameter and space of binding bars, widththickness ratio and strength of steel plate. It is shown that the binding bars help improving the confinement effect on concrete core in the middle of four sides of crosssection supplied by steel plate and delay or even avoid the development of local buckling of the steel tube before it attains yield strength, which thus increases the ultimate load and ductility of square CFT stub columns under axial compressive loads. The ultimate bearing capacity of the specimens, calculated by the methods of current specifications and codes is quite conservative, compared with the experimental results.
Keywords:square CFT stub column; binding bars; ultimate bearing capacity; ductility
